\begin{thebibliography}{1}

\bibitem{rfc3261}
J.~Rosenberg, H.~Schulzrinne, G.~Camarillo, A.~Johnston, J.~Peterson,
  R.~Sparks, M.~Handley, and E.~Schooler, \htmladdnormallink{``{SIP:} session
  initiation protocol,''}{http://www.rfc-editor.org/rfc/rfc3261.txt} RFC 3261,
  Internet Engineering Task Force, June 2002.

\bibitem{rfc2782}
A.~Gulbrandsen, P.~Vixie, and L.~Esibov, \htmladdnormallink{``A {DNS} {RR} for
  specifying the location of services {(DNS}
  {SRV)},''}{http://www.rfc-editor.org/rfc/rfc2782.txt} RFC 2782, Internet
  Engineering Task Force, Feb. 2000.

\bibitem{rfc2915}
M.~Mealling and R.~Daniel, \htmladdnormallink{``The naming authority pointer
  {(NAPTR)} {DNS} resource
  record,''}{http://www.rfc-editor.org/rfc/rfc2915.txt} RFC 2915, Internet
  Engineering Task Force, Sept. 2000.

\bibitem{rfc2199}
A.~Ramos, \htmladdnormallink{``Request for comments summary {RFC} numbers
  2100-2199,''}{http://www.rfc-editor.org/rfc/rfc2199.txt} RFC 2199, Internet
  Engineering Task Force, Jan. 1998.

\bibitem{rfc2434}
T.~Narten and H.~Alvestrand, \htmladdnormallink{``Guidelines for writing an
  {IANA} considerations section in
  {RFCs},''}{http://www.rfc-editor.org/rfc/rfc2434.txt} RFC 2434, Internet
  Engineering Task Force, Oct. 1998.

\end{thebibliography}
